Automatic indexing drill press and flame cutting machine



Dec. 2, 1952 YOUNG ETAL 2,619,707

y AUTOMATIC INDEXING DRILL PRESS AND FLAME CUTTING MACHINE I Filed Jan.27, 195o 11 sheets-sheet 1 Dec. 2, 1952 l.. L. YOUNG E-rAL 2,619,707

` AUTOMATIC INDEXING DRILL PRESS AND FLAME CUTTING MACHINE Filed Jan.27, 1950 1l Sheets-Sheet 2 EIL Dec. 2, 1952 YOUNG ,E1-AL AUTOMATICINDEXING DRILL. PRESS AND FLAME CUTTING MACHINE Filed Jan. 27, 1950 v l1SheecsrSheeiI 3 MANA.

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:inventors Milf 9L Cttornegs L. L. YOUNG E1-AL 2,619,707 AUTOMATICINCEXINC DRILL PRESS AND FLAME CUTTING MACHINE Dec. 2, 1952 11Sheets-Sheet 4 Filed Jan. 27, 1950 Gttoruegs y A A lilium //l ci C` wlam rl/M Dec. 2, 1952 L. YOUNG Al. 2,619,707

AUTOMATIC INDEXING LL. PRESS AND FLAME CUTTING MACHINE Filed Jan. 27,1950 11 Sheets-Sheet 5 Dec 2, 1952 l.. YOUNG E-rAL '2,619,707

AUTOMATIC INDExING DRILL PREss AND FLAME CUTTING MACHINE 11 Sheets-Sheet 6 Filed Jari. 27, 1950 nventors @fa/WWK *29m/'Mi MMV (lttornegsDec. 2, 1952 L. YOUNG ETAL A2,619,707

AUTOMATIC INDEXING DRILL PRESS AND FLAME CUTTING MACHINE ll Sheets-Sheet'7 Filed Jan. 27, 1950 Gttornegs Dec. 2, 1952 L. YOUNG AL 2,619,707

AUTOMATIC INDEXINGv LL. PRESS l AND FLAME CUTTING MACHINE Filed Jan. 27,1950 11 Sheets-Sheet 8 :inventors M; M y i Gttornegs Dec. 2, 1952 YOUNGETAL 2,619,707

AUTOMATIC INDEXTNG DRILL PREss AND FLAME CUTTING MACHINE l1 Sheets-Sheet9 Fil-ed Jan. 27, 1950 MAN Qui Dec. 2, 1952 L. L. YOUNG ETAL A 2,619,707

AUTOMATIC INDEXING DRILL PREss AND FLAME CUTTING MACHINE Filed Jan. 27,1950 11 Sheets-Sheet 10 DCC. 2, 1952 l L YOUNG ErAL 2,619,707

AUTOMA;IIC INDEXING DRILL PRESS AND FLAME CUTTING MACHINE Filed Jan. 27,1950 1l Sheets-Sheet ll f/f7 l fre i .fw

ff /f/f /ff/ /Zy #Wl .fl/.4 /ff #if j w ff /fr/ /ff/ y W g I Iff Anentors d l waff fffif/fz/Z MM J Gttornegs Patented Dec. 2, 1952AUTOMATIC INDEXING DRILL PRESS AND FLAME CUTTING MACHINE Leo L. Young,vAlbert C. Drechsler, and Bronislaw T. .Brzozowski, Cleveland, Ohio,assignors to General Motors Corporation, Detroit, Mich., a

corporation `of Delaware Application January 27, 1950, Serial No.140,918

12 Claims.

cept loading the unfinished Aworkpieces and removing the finishedpieces.

The combined mechanisms and automatic control means included in themachine by which this object is accomplished and novel `features thereofare :clearly illustrated in the appended ydrawings and described 1indetail in the following specification.

Figure 1 of the drawings is va -plan view of :the machine.

Figure 2 is an end elevation view.

Figure 3 is an enlarged kplan view of a detail shown in Figure l1.

Figure 4 is a vertical cross sectional view taken on lines 4-4 ofFigures 1 an-d 2.

Figure 5 is an enlarged end elevation view of 4a ydetail of Figure 6.

Figure 6 is van enlarged sectional view of a `portion of Figure 14withparts shown broken away and in section. Y

Figure '.7 .isan enlarged end elevation iview of a portion of Figure 2with parts shown broken away and in sections.

Figure B is an enlarged'sectional view taken on lines 8-8 of Figure 1-with'parts shown brok-en away and in section.

yFigure 9 .is an enlarged sectional view taken on lines y9--9 of Figure1 with parts shown broken away and in section.

Figure 10 is `an enlarged view of Idetails shown in Figure 9 with partsshown broken away and in section.

Figure 1l is .an enlarged side elevation View lof certain details ofFigure 4.

Figure l2 is an 'enlarged cross-sectional end elevation view vtaken online I'2-I 2 of Figure 11.

Figures 13, 14 .and 15 are views showing certain of the parts of Figure1l i-n different positions.

Figure 16 is a schematic View of Vthe mechanisms of the precedingfigures, piping therebetween and-certain'electrical control devicestherefor.

Figure' 17 is one half of a schematic wiring diagram showing theelectrical control apparatus and circuit connections. y

Figure 17a is the other :half of .Figure 17.

As best seen in Figures 1, 2, 4 and 6, the machine oomprises -a frame Ihaving a tank portion 3 at one end and a pair of pneumatic three jawinternal chucks 5 'supported on horizontal hollow spindles 1 rotatablysupported in parallel relation in bearings 9 in the frame I. The twochucks 5 support in horizontal centered relation, separate work-pieces,which 'in this case are forged steel engine cylinder liners 'I I showndotted lines in Figure 4 within the tank yportion 3 of the machineframe. Water or other ysuitable coolant is circulated and maintained inthe tank 3, level with the top of an overflow pipe 'I3 therein, shownbest in Figure 4, so that the lower portion of each cylinder liner Il issubmerged, both for cooling and to intercept molten metal from the portsI5 being flame Vcut in the I.upper portion of the liners Il to preventthis molten metal "from falling directly on and adhering to the lowerportion of the liners.

A pair of cutting torches I'I are secured adjacent each end of a:supporting bar I9 which is pivotally supported at the ends by verticalpins 2I von separate link-s 23, extending parallel to the axis of thevchucks 5. The opposite ends of each of the links 23 are pivotallysupported by vertical pivot pins 24 on the `outer -ends .of separatealigned support levers 25 extending in the same direction transverselywith respect to the links `23. The inner end of each of the levers 25 issecured to `a vertical pivot shaft 29, as best illustrated in Figure 4.Each of the shafts 29 is supported in bearings 30 in the frame I attransversely spaced points for lrotation about a vertical axis. Thelower end of each shaft 29 has .a sprocket 3| secured thereto and achain connects `the sprockets 3I and includes a tension `spring 31 sothat the shafts 29 are caused to rotate together through the same :anglein either direction. A conventional motor driven magnetic tracermechanism, indicated generally by the character reference T is securedon the torch supporting bar I9 intermediate the torches Il as best seenin Figure 2. An electromagnetic roller 39 of `the tracer mechanism Textends downwardly therefrom for rotation about a vertical axis, withina rounded corner vrectangular opening in steel template -plate 4Iadjustably secured to the frame I as bestseen in Figures l, 2, 3, 4 and.16.so thatv the electromagnetic lroller 3'9 is held by magneticattraction in frictional driving relation with the inner periphery cfthe rectangular template opening and when rotated by an electri-c tracerd-rive motor TM traces a rectangular path therein, thereby causing thetorches to be moved in a corresponding path directly ,above and slightlydisplaced on the same side of each of the axes of the chucks supportingthe liners II in order that rectangular lports extending tangentially toeach liner axis are simultaneously cut by the torches Il'.

Two automatic drilling mechanisms generally indicated by the characterreference DM are secured on opposite sides of the frame tank portion 3as best shown in Figure 9. Each of these mechanisms are of a well knowntype and include two-way pneumatic feed and retracting mechanisms for adrill 65, as shown in Figure extending through a bushing IIt secured inan opening 41 inclined transversely, inwardly and upwardly in each sideIwall of the tank 3. The bushing 45 is secured in the opening 41 by aclamping mechanism generally indicated at 49 to drill a holetangentially through each of the liners at a point angularly displacedfrom each torch I'I so that upon the next indexing operation of theliners the torches I1 will be directed axially with respect to thedrilled holes for the start of the port flame cutting operation. Anelectric motor 5| is shown in Figure 1 connected by pulleys and belts toeach drilling mechanism DM to rotate the drill 35. The operation of thepneumatic drill feeding and retracting mechanism which causes alternatefeed and chip retracting movement of the drill until the drillingoperation is ycompleted will be described subsequently.

In that it is rst necessary to drill a hole in each liner and then indexboth liners so that these holes are aligned beneath the torches for theinitial port cutting operation thereon, a V- shaped ramp 53, is bestshown in Figures l, 3, 8 and 16 normally positioned within one end ofthe opening in the template plate 4| to modify the path of movement ofthe magnetic tracer roller 39 therein during the initial drilling of theliners I I. The ramp 53, as best illustrated in Figure 8, is slidablymounted vfor vertical movement in the frame I into and out of the lowerend of the template opening and is pivotally connected by a pin 55 toone end of a rocking lever 55 pivoted at 51 on the frame I intermediatethe ends. The opposite end of the lever 5S is pivotally connected at 51'to a double acting plunger 58 in a pneumatic cylinder 59 for elevatingand depressing the ramp in and out of the template plate opening. Afour-way electropneumatic reversing valve SRV is provided forcontrolling reverse movement of the plunger 58.l

Indexing of the liners II is accomplished by the following indexingmechanism. An indexing power cylinder 6I, best shown in Figures l, 2 and16, is secured transversely on one end of the frame I and includes adouble-acting piston therein having a rack E3 formed in the outwardlyextending end of the pistonrod 65. The rack 63 is guided in ways in theframe I and meshes with a pair of gear segments 6l', each adjustablysecured to a ratchet wheel E9 rotatable on each of the chuck spindles 'Iadjacent an index plate 'Il thereon having peripheral indexing notchesand a pawl 'I3 pivoted thereon and urged by a spring 'I4 into contact`with the adjacent ratchet, as best shown in Figures 6 and 7. It will benoted that the index plates II and ratchets Erl andpawls 'I3 arearranged on each of the spindles 'I so that upon outward movement of therack 63 from the cylinder 6 I, clockwise angular movement is imparted tothe right chuck spindle, as shown in Figure 2, through an angle of 105degrees and upon inward movement of the rack -counterclockwise angularmovement through the same angle is imparted to the left-hand chuckspindle. The indexing plates are provided with twenty-four indexingnotches and each indexing plate is indexed to each of twenty-fourpositions and retained in each of these positions by means of a detentTI formed on the piston rod 19 of separate. double acting pistons notshown, each piston being made movable in one of two cylinders ACZ andAC3 mounted on the frame I adjacent each indexing plate 1I. Separateswitches LSI'I and LSI8 are secured to the frame I and each is moved tothe closed position only upon entry of each detent 'I1 into a notch ofan indexing plate 1|.

In order to automatically shut down the machine, when all of the portsin the two liners have been flame cut, an index counting and shut downmechanism, generally indicated by the character reference CM in Figures2, 4, 11, 12, 13, 14, 15 and 16, is provided. This mechanism as bestillustrated in Figures 2, 4r, 11 and 12 comprises a bracket 8| securedto an upstanding portion 83 of the frame I in transverse alignment withthe camshaft 85 of a conventional gas valve mechanism, generallyindicated at 81, also secured to the frame portion 83 and including ahydrogen pilot valve 89,-a low pressure oxygen valve 9i), an acetylenevalve 9|, and a high pressure cutting oxygen ,valve 82. Each of thesevalves is opened by a separate cam shown on the camshaft upon manualrotation of either handle 93 on the ends of the camshaft 85. One end ofthe camshaft 85 is rotatablyjmounted in a hub portion 95 of the bracket8| of the counting mechanism CM, as best shown in Figure 12 and a gascontrol disk 91 is secured to the camshaft on one side of the hubportion. A counting ratchet wheel 99 having twenty-five teeth and arocker arm IUI are rotatably mounted on a reduced diameter hub portionof the bracket 8| and retained thereon by a retaining collar |03 securedthereto through which the end camshaft 85 projects, a collar I05beingsecured to the camshaft adjacent the retaining collar |03. A stop pawl|01 is pivoted Yat H39 to the bracket 3| and is urged by a spring IIIinto engagement with the teeth of the ratchet 99 to prevent backwardmovement thereof. An indexing pawl IIS is pivoted at II5 to the rockerVarm |0I and urged by a spring IIS into contact with an arcuate hubsurface IIB' of bracket 8| of the same diameter as the periphery of theratchet S9 and alongside the lower portion thereofv and toward the teethof the ratchet to advance it one tooth at a time for each successiveindexing movement of the liners II. A shutoff lever II'I` is alsopivoted at I|8 to the rocker arm and provided with a guide pin IISprojecting inwardly into an annular guide groove I2I in the adjacentface of the ratchet wheel 99 and a spring |22 urges the guide pin I I9radially inwardly so that the guide pin H9 enters a connecting slot |23extending angularly inwardly from the annular guide slot and enters aconcentric arcuate guide slot |25 in the ratchet 99 and into contactwith an abutment '|26 on the gas -control disk to cause closure of thegas valves when the liners are indexed to the last port cuttingposition. As best seen in Figure 1l an arcuate shaped shield I 21 ispivoted at I 29 to the bracket 8| alongside the. ratchet wheel 99 and isprovided with an outer arcuate surface of the same radius as the inneredge of. the annular guide groove |2| in the` ratchet wheel 99 toprevent entrance of the guide pin I I9 of the shut-oil lever into thetransfer slot |23 except when the liners are indexed to the lastposition immediately adjacent to the starting position. A spring |33 isplaced between the shield and bracket and urges a stop surface |34 onthe shield into contact with a stop surface on the bracket to positionthe outer arcuate surface of the shield in flush relation with the inneredge of the groove |2| in the ratchetrwheel 99.

, A connecting rod |35., as best shown in Figure 4,

is pivotally connected at one end to the rocker arm and the other end ofthis rod is slidable in a sleeve |31 pivoted at |39 to one leg of a bellcrank I4I pivoted at |43 to the upstanding portion 83 of the frame I.Springs |44 and |45 are placed in the rod |35 at either end ofthe sleeve|31 between adjusting nuts |46 threaded on the rod. The other leg of thebell crank |4| is slotted and a longitudinally adjustable link |41having a pivot pin |48 at the upper end is slidable in this slotted endof the bell crank. The lower end of the link |41, as best shown inFigures 2 and 7, is pivoted by a pin |49 to the right-hand indexingratchet wheel 69.

The automatic control means for the above described machine compriseselectric switches LSI, LSZ, LS3 and LSI 9 secured to the template ramp53 and switches LS4, LS5, LS6, LS1, LSI] and LSS secured to the template4| as best shown in Figures 3 and 16, each of these switches having anactuating member operated upon contact and movement of the magneticroller 39. Limit switches LSII and LS|2 are shown secured on the rear ofeach of the drilling mechanisms and are operable by retraction of thedrills and limit switches LSI3 and LSH are secured to the front of eachof drilling mechanisms and are operable upon completion of the drillingoperations on the liners A high pressure oxygen control switch LSI5 andan automatic stop switch LSIB are secured on the bracket 8| of the indexcounter and shut down mechanism, as best seen in Figure l2. Theactuatingy member of the high pressure oxygen control switch LSI5 ismoved to the switch closing position by a plunger |50 and a is movedupon contact of a pin |55 in the side ofthe gas control disk 91 at theend of the last liner port burning operation to open the switch LSIB.Electromagnetic valves SHPO, vSLP() and SA are shown in Figure 16provided in the high and low pressure oxygen and acetylene lines betweenthe gas valve 81 and torches I1 `and a hydrogen pilot line is shownextending between the gas valve to a point adjacent the tip of eachtorch I1. As previously mentioned a four-way electropneumatic reversingvalve SRV is shown connected in anrair pressure line for the rampoperating cylinder 59. An electropneumatic pressure application andrelief valve SIV is shown, in Figures l and A16, in an air pressure linefor an air trigger cylinder ACI, shown mounted on the vframe I in Figure2, and having an air ejected plunger |56 operating the movable element|51 of a four-way reversing valve VI in the pressure line for thetwo-way cylinder ACZ for left-hand indexing detent. a spring, not shown,Aretains the .plunger retracted. The movable element |51 of the valveVI, shown in Figure, 2 mounted on the frame I, is movable the. oppositeway by a stop CI secured on the rack63 of the indexingr cylirh der 6IAnother four-way reversing valve V2 is shown connected in a pressureline to the. twoway cylinder for the right-hand indexing detent. Themovable element |59 of the reversing valve V2, shown secured .to theframe I in Figure. 2, is movable, toY opposite reversing positions bystops C2 and C3 also secured to the rack 630i the indexing cylinder asbest seen in Figure 2. Separate four-way electropneumatic reversingvalves SDLI-I and SDRH are shown in the, separate air pressure linesleading to each ,of the drilling mechanisms DM' to feed and to retractlthe drills.

The electromagnetic roller 39, magnet, winding T and tracer motor 'I'Mdriving this rolleris en ergized from a direct current line shown inFigure 17. The tracer motor TM is connected ,in

series with the upper pair of normally open contacts of anelectromagnetic. main switch SW 5 and a holdingrelay HRI, the lowernormally open. contacts. of a sequence relay SR2, the central pair -ofnormally open contacts of a holding relay HB3,

the normally closed contacts of a. time delay relay TDRI and the lowernormally open pair of contacts of the holding relay HRI and main D. C.switch SW5 across the positive and negative conductors of the directcurrent line by conductors IBI', |62, |63, |64, |65, |66 and |61.Themagnetic winding TW of the tracer roller 3.9 is shown connecteddirectly between the kconductors |6I and |61. A stop-start push buttonmain control switch MSS is connected in series with the winding of themain D. C. switch SWS across the .direct current line to controlenergization and de-energization of the tracer motor TM and winding TWof the magnetic roller driven thereby. The lower closed contacts rofthe. holding relay HB3 and open central contacts of the holding relayHRZ are connected in series between conlztors |62 and |64 by conductors|62,`251 and The other control apparatus is connected with analternating current line 'conductors 'Ll and L2. The normally open andlower upper .con- -tacts of a main electromagnetic switch SW4, an oil-onsequence relay SRI and a sequence relay SR3 are connected in series withthe alternating line conductors L| and L2 by conductors |69, |19, |1I,|12, |13 and |14, the windings of the low pressure oxygen valve SLPO andacetylene valve SA being connected in parallel between the conductors|1| and |12 by conductors |1| and |12. A drill motor 5| is connected inseries with a manually operable switch SW2 between conductors |69 and|14 by conductors |15, |16 and |11 and the other drill motor 5I isconnected in series with another manually operable switch SW3 betweenthe conductors |69 and |14 by conductors |18, |19 and |80. The windingof another sequence relay SRA is connected in series with the normallyopen switch LS4 between conductors |69 and |14 by conductors |8I, |82,and |83. The winding SRV of the reversing valve for theramp cylinder 59is connected in series with the normally closed upper and lower contactsof the relay SR4 betweenconductors |69 and |14 by conductors |8I, |83',|85 and |86. A normally open index check push button switch PBS, and theleft-hand index detent switch LS|1 which is normally open when theleft-hand detent 11 is in an index slotv and the normally open indexcheck switch LS9 are connected in series between and |12 betweenconductors |1| and |12.

7 conductors |69 and |10 by conductors |81, |08, |89 and |90. Theright-hand index detent switch LSIB, which is closed when the right-handdetent 11 is in a detent slot is connected in parallel with the switchLS|1 by conductors |9| and |92. The normally closed switch LS3, servingas a stop switch and the normally open automatic stop switch LS|6 in theindex counter mechanism CM are connected in parallel with the pushbutton switch PB by conductors |93, |94 and |95 between conductors |69and |83. The winding of the sequence relay SRI is connected byconductors |96 and |91 between conductors |88 and |14. The winding ofthe sequence relay SR3 is connected in series with the normally openswitch LS2, serving as the gas turn on switch, between conductors |10and |13 by conductors |98, |99 and 200. The open switch LSE, serving asthe gas turn off switch and an open push button switch PB2 are connectedin parallel with the switch LS?. by conductors 202, 203 and 204 betweenconductors |10 and |99. The normally closed contacts of a time delayrelay 'IDR3 are connected. in series with the open switch LSIB, servingas the high pressure oxygen control switch, and the winding of the highpressure oxygen valve SHPO by conductors 205, 206, 201 and 208 betweenconductors |1| and |12. A signal lamp L is connected in parallel withthe switch LS|5 and winding of the valve SHPO by conductors 209 and 2|!)between conductors 206 and |12. The windings of the low pressure oxygenand acetylene valves SLPO and SA are connected in parallel relation byconductors |1| rlhe winding of the time delay relay TDR3 is connected inseries with the normally closed upper contacts BSR of the sequence relaySR2 and the open switch LSID, serving as a` time delay set switchbetween conductors |10 and |12 through conductors 2|3, 2|4, 2|5, 2|6 and2|1. One winding terminal of the time delay relay TDRI is connected tothe conductor 2|6 and the opposite terminal is connected by conductors 28, 2 I9 and 22| to the conductor |13. The winding of the holding relayHRI is connected between conductors 2|3 and 2|9 by a conductor 2|3.

One winding terminal of the sequence relay SR2 is connected to theconductor 2 i9 by a conductor 223 and the opposite terminal connected bya conductor 229 to one contact of each of the open switches LSB, LSB andto one contact an open push button switch PPS. Each of the other -switchcontacts are connected by separate conductors 225, 229 and 221 toconductor 2|3. The switch LSB serves as the tracer motor control switch,the switch LS@ serves as the tracer motor delay control switch and thepush button PBS serves to control operation of the sequence relay SR2.

An open push button control switch PBl for the drill motors 5| and theopen starting control switch LSI for these motors are connected inparallel by conductors 228, 229, 239, 23| and 232 across the normallyopen upper contacts of the holding relay HRS. One winding terminal orthe relay HR3 is connected to a conductor 233 and the open switchesL-S|3 and LSI@ are connectedin parallel by conductors 235, 235', 233between the conductors 233 and 232. The switches LS|3 and LSU! serve asdrill feed limit switches for the drilling mechanism DM. The otherwinding terminal of the relay HRS is connected in series by conductors231 and 232% with an open push button switch PB3 to conductor 2|9 forcontrolling the S feed and retraction of the drilling mechanisms DM.

The open switches LSI! and LSIZ, serving as retracting limit switchesfor the drilling mechanisins DM, are connected in series with theWinding of a holding relay HRZ between conductors 2|3 and 2|9 byconductors 239, 240, 29| and 242. The winding of a time delay relayrIDR2 is connected in series with the open lower contacts of relay HR2by conductors 243 and 294 between conductors 232 and 231. The opencontacts of the relay TDR2 are connected in series by conductors 245 and24S between the conductor 232 and a conductor 241 connected to onewinding terminal of each of the electromagnetic reversvalves SDLH andSDRH of the drilling mechanisms DM, the opposite winding terminals ofthese valves are connected by conductor 248 to conductor 2i9.

The upper closed contacts of relay HRS, the winding of the solenoidvalve SEV, the upper open contacts of relay HRE, and the open pushbutton switch PE4, serving as a manual index switch are connected inseries by conductors |84, 250, 252 and 253 between the Lipper windingterminal of the electropneumatic valve SRV and conductor |13. rShe openswitch LS1, serving as an indes; trigger switch is connected byconductors and 295 in parallel. with the switch PB4 between conductors252 and |13. The open conseccnd from the bottom of relay HRZ, and thelower closed contacts of relay HB3 are connested in series between theconductors |62' and its by conductors 251 and 258.

With the cylinder liners centered in the chucks 5 and theelectromagnetic tracer roller 39 indexing mechanism in the rst orstarting position as shown in Figures 2 and 16 the handle 93 of the gasvalve 81 on the valve camshaft 85 is rotated to open the hydrogen pilot,low and high pressure oxygen and acetylene valves 89, 90, 9| and 92 andthe hydrogen pilots are lighted adjacent the torches il. Closure of themain off-on push button switches MS4 and MSS causes energization of thewindings of the main D. C. and A. C. line switches Eil/V5 and SW/l andeach of the upper and lower contacts thereof close as these push buttonswitches are shown connected in series with a main switch winding acrosseach line.

Closure of the contacts of the main A. C. switch SWfl causesenergization of both drill motors 5|, one being energized throughconductors |69, |15, |16, |11 and |14 providing the manual controlswitch SW2 therefor is closed and the other drill motor being energizedthrough conductors |69, |18, |19, |89 and |19 providing the manualcontrol switch SW3 therefor is closed. Energize.- tion of the winding ofthe electropneumatic ramp valve SRV also takes place through both oftheclosed contacts of the` sequence switch SR4 and conductors |69, |3l,|83', |85, |99 and |14 to cause upward movement of the ramp '53 intoopening of the template 4| by the action of the ramp cylinder 5e andplunger 5E therein.

Closure of the contacts of the main D. C. switch SW5 in the D. C. linecauses energization of the winding TW of the electromagnetic tracerroller 39 through D. C. conductors |6| and |91 causing the roller to bemagnetized and move into driving contact with the wall of the opening ofthe template to the position shown in Figure 16.

Momentary closure of the manual start-stop push button switch P285momentarily energizes the winding of the oir-on sequence relay SRIthrough conductors |69, |61, |88, |96, |91 and position and remain inthis position. This causes energization uof the winding of the,holdingrelay HRI for the tracer motor TM and closure of the contacts Yofrelay HRI and energize the winding vof the holding relay HRZ forqcausingfeed and retraction of the drilling mechanisms. Energization of thewinding of the relay HRI is through the closed contacts 'of the relaySRI and conductors |10, 2|3, 2|3, 2|9, 22| and |13. Energization of thewinding of the relay HB2 'also takes place through the switches LSII andLSIZ on the rear of the drilling mechanisms, which switches are closedwhen the drills are fully retracted, and through A. C. conductors |10,2|3, 23S, 240, 24|, 242, 2|9, 22| and |13 and this causes closure of allthree contacts of the relay HRZ. Closure of the control contacts of therelay HRZ causes energization of the tracer lmotor TM through thesecontacts, the closed central contacts of the relay HB2, the closed lowercontacts of holding relay. HRS, the closed contacts of time delay relayTDR! and D. C. Iconductors |62, |62', 251, 2553, |64,1|S5, |68 and |61.This causes starting of the tracer motor TM and rotation of themagnetized electromagnetic tracerroller 39 countercloc'kwise so that thetracer mechanism TM moves clockwise within the templateY opening,causing the ytorches I1 to follow movement of ,the tracer mechanisms asthey are also vsecured to the .supporting bar I9. Closure of the othertwosets of contacts of the holding relay HR2 sets up circuits for thefeeding and retracting control mechanism for the drills and for theindexing mechanism.

'The roller 39irst contacts the actuating member in the template 4| forthe index check switch LSB and causes closure thereof and if theswitches 'LS'I1 and LS'IB are open upon full entry of both detents T1into the startingV notches of the index plates 1| the tracer rollerv3'9`c'li'm`bs up the toe of the ramp 53 now in the template opening.Should 'either of the switches L'Sl or LSIS be closed by failure ofeither detent to enter a notch in the indexing plates a circuit isvestablished through the index checkl switch LSQ and either 'the switchesLS`|1 or LS|8 and A. C. conductors |10, |90 and |89, |88, |96, |91 and|14 or |10, |98 and |89, 19|), I'9`|, |88, |96, |91 and '|14 toreene'rgize the winding ofthe sequence relay SRI and the contacts openlto deenerg'ize and stop the tracer moto'nTM. Therefore if both detentswitchesLSl'I and LS 8 are open the 'tracer motor continues to drive thetracer roller.`

The tracer roller 39 next contacts and moves the actuating member of thetime delay set switch LSIU in 'the toe of the ramp to cause 'closure' ofthe switch LSH). the winding o'f the time delay Vrelay TDR`| through theupper closed D. 'C. 'contacts of vthe vsequence relay vSR2 vand A. C.conductors 213, 2H, 215, 2I8, '2|9, 22| 'and |13. vvThis causes thecontacts of the Arelay TDR! to 'open and deenergize tracer motor rTMandthe 'roller `to coast into contact with the actuating member oftheswitches LSI, LSZ, and LS3 and also remainin contactr with the actuatingmember of the switch LSIU holding all of theseswitches closed; A circuitis also set up upon closure'ofthe time 'delay set switch Lsln Ythroughconductors 2|6, 2|1 to conductor |12.

Closure of the switch LSI, serving as a drill-- ing mechanism startswitch, causes energization of the winding and closure of the contacts'`of 'time delay relay TDR2 and the winding of the holding relayvEnergiza-ti'o'n of the winding This causes 'energization of,

of the re1ay, TDR2 taking place through the switch LSI the closed lowercontacts ofthe holding relay. HRZ, the normally closed contacts of themanua1 stoppush button switch P133 for the drill mechanisms DMand A. C;conductors 2|4, 229', 228, 232, 243, 244, 231, 238, 2-|9,v2-2| and |13.Closure of the contacts Of `the timedelay relay TDR2 causes energizationof the electropneumatic valves SDLH and SDRH through these contacts andA. C. conductors `232, 245, 246, 241, 248, 239 and 2|9 to cause feed ofthe drills 45 into the respective cylinder liners bya'ction of thepneumatic feed mechanisms of the 4drill feed and retracting mechanismsfor the drilling mechanisms DM.l As the drills 45 move on the feedstroke the switches LSI| Aand LS|2 on theback of the mechanisms areopened to deenergize the winding of the holding relay yHRZ and'itscontactsfall to the position shown `and also to deenergize thewinding ofthe vtime delay relay TDR2 Vthe contacts of which are delayed in openingand;when these contacts openthe windings of `the electropneumaticvalvesSDLH and SDRI-I'aredeenergized to causereversal of these valvesto causereversal of the drilling mechanisms DM and retraction of the drills andreclosure of the switches LSII and-L SI2. This causes reenergization ofthe winding ofthe relay HB2 and closure of the contactsthereof whichcauses reenergization of the time delay relay TDR2 to cause anothervfeeding operation ofthe drills. Alternate feed and retraction-of thedrills continues in the above described manner until the ldrills breakthrough each of the 'cylinder liners. Momentary energization of eitherthe drilling mechanism control switches LSIl or` the push button switchvPBI through thenormally closedV switches LSIB andfLSIlIon the forwardend of the drilling mechanisms and A. C. conductors 232, 235, 236, 235',236g 233, 231,- 238, 2|922-| andy|13 yand the normally closed pushbutton switch -PB3 causes closure of the upper contact of relay HRB Vtokeep the windingsof the relay TDR2 andthe valves ASDLH and SDRH for thedrilling motor energized. When the winding of relay HB3 is energized thesecond contacts from the bottom of this relay also `close tofsetv up aD. C.. holding circuit to the tracer motor TM. When `,both drills breakthroughthe liners 'both drill Vfeed limit switches LSI3 and LS|4 on theforward side of the drilling mechanisms DM are opened as the. drills areat the maximum feed lposition and break through;- Opening of theswitches LS|3 and L S|4 caused energization ofthe winding of theholdingrelay HB3 and the opening of the upper contacts thereof to deenergizethe valve windingsfSDLI-I and SDRVH to cause full retraction of theVdrills and opening of 'the second contacts fromjthe bottom opens the D.C. holding circuit to the tracer motor TM. l Y k Closure of the-switchLS2, serving as turn' on gas switch, causes energization of the kwindingof the sequence relay SR3 through A. C; coni ductors |10, |98, |99, 200and v|13 and the relay contacts close. This causes energization of thelwindings of the electromagnetic low pressure oxygen and acetylenevalves through-A. C. 'con-'- ductors |10, |1|,-|1I', |12', |12and |13causing the opening of these valves and flow lof, low pressure oxygenand acetylene tof the torches 'I1 land ignition -of -these gases by thehydrogen; pilot flame to preheat the -cylinder'liners Il. Closure 'ofthe contacts -of 'the relay'SR'3 completes the circuit previously set up-to the winding of the time delay relay TDR3 and sets up a circuit tothe winding of `the high pressure oxygen valve SHPO and signal lamp Lincluding the open contacts of the relay TDR3, the open contacts of thehigh pressure oxygen switch LS| on the index counter mechanism and A. C.conductors |1|, 205, 206, 281, 208, 209, 2|0 and |12. The high pressureoxygen control valve cannot be energized to open as the switch LS|5 sopen and no high pressure cutting oxygen can flow to the torches |1 atthis time.

`Closure of the switch LS3, serving as a tracer motor control switch,causes energization of the winding of the sequence relay SR2 through A.C. conductors 2|3, 225, 224, 223, 2|8, 2|9 and 22|, and this causes theupper contacts of the relay to open and deenergize the windings of thetime delay'relays TDR| and TDR3 to cause delayed reclosure of thecontacts thereof. The contacts of the relay TDR| are arranged to reclosein seven seconds to cause restarting of the tracer motor and thecontacts of the relay TDR3 are arranged to reclose in six seconds to setup a circuit to the winding of the electromagnetic high pressure orcutting oxygen valve SHPO and signal lamp L through the open oxygencontrol switch LS|5 on the ratchet counting mechanism. As mentioned theswitch LS|5 is open when the index counting mechanism CM is in thestarting position as then the actuating member of the high pressureoxygen control switch LS|5 on the index counting mechanism CM is openedby the spring |5| moving the plunger |50 into the notch |53 in the faceof the ratchet wheel 99. In all other positions of the ratchet Wheel theswitch LS|5 is closed. As explained closure of the tracer motor controlswitch LSB causes energization of the winding of the sequence relay SR2through A.` C. conductors 2|4, 2|3, 225, 224, 223, 2|8 and 2|9 causingthe lower D. C. contacts of the relay SR2 to close which sets up acircuit through D. C. conductors |6|, |62, |63, |64`and |65 to thetracer motor TM and through the lower closed A. C. contacts of thesequence relay SR2 and the now open contacts of the time delay relayTDR| which close after a seven second interval to restart the tracermotor. This causes the tracer roller 39 to-move out of contactwith theactuating member of the switches LSI, LS2, LS3 and LS|0 causing all ofthese switches to open. Opening of the gas control switch LS2 causesdeenergization of the winding of the sequence relay SR3 but its contactsremain closed and opening of the switch LS3 causes deenergization of theWinding of the sequence relay SR2. The tracer roller then rolls off theheel of the ram 53 and next contacts and moves the actuating member ofthe switches LS4, LS5 and LSB to cause closure thereof.

Closure of the switch LS4, serving as a ramp control switch, causesenergization of the winding of the sequence relay SR4 through A. C.conductors |69, |8|, |82, |83 and |14. This causes opening of thecontacts of the relay SRA to cause deenergization and reversal of theelectropneumatic ramp valve SRV and the ramp 53 is Withdrawn from thetemplate opening by reverse vaction of the ramp plunger 58.

Closure of the gas control switch LS5 causes lthe second energization ofthe winding of the sequence relay SR3 through A. C. conductors |10, 20|,202, 203, |99, 200 and |13 which causes its contacts to remain closedand keep the electromagnetic low pressure oxygen and acetylene valvesSLPO and SA energized and open.

Closure of the switch LSB, serving as a tracer motor delay switch,causes reenergization of the winding of the sequence relay SR2 throughA. C. conductors |10, 2|3, 226, 224, 223, 2|8, 2|9, 22| and |13 to causethe lower D. C. contacts of the relays SR2 to remain closed and keep thetracer motor energized and operating so that the tracer roller rollsover the actuating member of the switches LS4, LS5 and LSS withouthesitation and continues around the opening in the template 4|. Thetracer roller next contacts and moves the actuating member of theswitches LS1 and LS5! moving the switch LS1 to the closed position andmoving the switch LSB to the open position.

Closure of the switch LS1, serving as an index trigger switch, sets up acircuit including the winding of the ramp valve SRV, the upper contactsof holding relay HB2, which are opening and closing as the drillingmechanisms move .back and forth on the feed and retracting strokes, thewinding SIV of the valve controlling index triggering air cyclinder ACI,the normally upper contacts of the holding relay HR3, which are open asthe winding is energized and the contacts of sequence relay SR4 whichare open. Thus as long as the contacts of the relay SR4 are open and theramp is moved down the winding of the Valve SIV cannot be energized tocause indexing of the liners. Also as long as the drilling mechanisms DMare on the feeding stroke the switches LSH and LS|2 are open and thewinding of the relay HB2 is deenergized and its contacts are open.

Opening of the normally closed switch LSB, serving as an automatic stopswitch, interrupts a circuit including the stop switch LS|6 on the indexcounting mechanism CM, which is open now and closed only when thismechanism is'in the last indexing position, the winding of the relay SRIand A. C. conductors |69, |93, |94, |95, |88, |96, |91 and |14. Theabove operation of the switches LS1 and LS8 causes no operating changesand the tracer roller continues on around the template opening andcontacts and moves the actuating member of the index check switch LSB asecond time causing the second closure thereof.

Reclosure of the index check switch LS9 provides an additional checkingoperation for the'index detents 11 and if still fully engaged in thenotches in the index plates 1| the detent switches LS|1 and LS|8 arestill open and closure of the switch LS9 does not stop movement of thetracer roller and it continues on around the template opening as theramp now is withdrawn downwardly therefrom. The'tracer roller nextcontacts and moves the actuating member for the switches LS4, LS5 andLSB for the second time causing reclosure thereof for the second time.

The second closure of the ramp control switch L S4 energizes the Windingof the relay SR4`and its contacts close to energize the winding of theramp valve SRV which again causes the ramp to be moved upwardly into thetemplate opening by reverse action of the ramp cylinder and plunger 58and 59.

The second closure of the gas control switch LS5 causes reenergizationof the winding of the sequence relay SRS for the third time causing itscontacts to open and deenergize the windings and cause closure of thelow pressure oxygen and acetylene valves SLPO and SA.

The second closure of the tracer motor delay switch LSB causesenergization of the Winding of the sequence relay SR2 for the third time'causing is ths-lower D. C. contacts to open and the upper A. G.-vcontacts to close. ,Qpening of the lower D. C. contacts of the relaySR2 stops the tracer motor TM with the roller in Contact with theactuating member of the switches LS4, -LS5 and LSG closed. the tracermotor is stopped and the supply'of -low pressure 'oxygen and acetyleneis discontinued to the torches and both drilling mechanisms DM stilloperating.

` As explained When both drills 45 'break through the liners Y|| both ofthe switches LIS|3 and -LS|4 o'the forward end of these mechanisms opencausing deenergization of theV winding of the holding 'relay HRS and itscontacts to fall to the "normal position as shown in Figure 11. Theopening of the upper contacts of the relay HRB deener'g'izes thewind-ings of the electropneu'ma-tic reversing valves' SDLH and SDRH Vforthe drilling mechanisms DM causing full retraction of the drills which'causes' closiire' of the switches LSI andLSlZ on the rear of thesemechanisms. This oafs'efs' energiZation-of the winding of the holdingrelay HRZ and its contacts close and remain closed. l I

l"Closure of the contacts second from the bottom ofthe :relay HRZ andthe lower contacts of the relay HB3 causes restarting of the tracermotor TM. Closure of the contacts second from the top 'of relay HR-3sets up a circuit including the now closed contacts of the relay SRd,the Wind-- ings SIV, closed upper contacts of relay HRZ, opfen indextrigger switch LS1 and A. C. conduc-V tors |69, |8|, |83', |84, 250,25|, 252, 2'55, 256 and |14 and when the tracer roller next passes overthe actuating member of the switches LS1 and LS8, causing the indextrigger switch LS1 to' be closed momentarily and the automatic stopswitch LS8 to be opened momentarily rfor the second time. Y

Momentary closure 'of the index trigger switch LS1 completes momentarilythe circuit set up to the winding SIV of the valve of the index triggercylinder ACI and it receives a puff of air pressure causing the plunger|58 to move out `and lmove the movable element |51 of the reversingvalve Vl to the reverse position from that shown. This causes airpressure to enter the left-hand detent cylinder A02 to withdraw detent11 from LH indexing plate 1| and air pressure to enter the indexingcylinder 6| and cause thefrack 63 'to move to the left causing the lefthand gear segment '61, ratchet 69, pawl 13, index plate 1|, spindle 1and liner to be indexed 105 clockwise. The stop C| on the rack 63contacts and movesthe movable element |51 of valve Vl to th'exreverseposition to reverse movement of the detent in the left detent cylinderand the rack. This causes the left handdetent 11 to enter a differentnotch. in the left hand index plate 1| and hold it in this position. Atthe same time `the valve VI wasreversed by the stop CI another stop C2on the lrack moves the movable element 15S-of the valve V2 to apply airto the right hand detent cylinder A02 vrand withdraw the right handdetent and the rack 6 in moving to the right causes the v'right handgear segment 61, ratchet 69, p'aWl 13, index plate 1|, spindle 1 andliner to be indexed 105 counterclockwise, Movement of the rack to theright causes -another stop C3 on the rack to contact and move themovable element |59 of the valve V2 to its original position, as shown,to apply air pressure :to the right hand 'detent cylinder AC3 Vand cause`the detent 1| to enter another notch in the right hand indexing plate.v13u-ring this time the r4 puri 'of al-ii" applied to "theAV index.trigger cylinder ACI has leaked oli and is spring returned to its normalposition as shown.

Duringclockwise movement of the hand ratchet 69 and linkage |41, |4| and|35 interconnecting the right hand ratchet 69 to the rocker arm |0| ofthe counting mechanism move the rocker arm-111| clockwise Viewedi-nfFirel1.y The indexing pawl H3 lon the rocker then rides the lower arcuateextremity of the hub portion IIE of the bracket 8| and enters one toothof the ratchet 99 to advance it clockwise one tooth only. Returncounterclockwise movement of the rocker arm IBI by returncounterclockwise movenient ofthe indexing ratchet E9 causes the indexingpawl 13 on the rocker to ride back onto the hub surface H6 of thebracket. The `stop p'afwl |01 prevents counterclockwise movement of theratchet 99. The shield |21 of the index counting and shut downmechanisnrCM prevents entry of the guide pin ||9 into the connectingslot |23 of the ratchet wheel f9.9 and rides the inner surface of theguide groove |2| and outer arcuate surface of the shield |21 for bothdirections of rotation of the rocker arm |'0|. As explained this onetooth of movement of the ratchet of the counting mechanism CM causesclosure ofthe high pressure oxygen control switch LSIE thereon and itstays closed inall positions exceptthe loading vand startingfposi-tiono'f the spindles" '1 `rarid starting posi-tion of the fcountingmechanism, as'v shown in the drawings, so that high pressure or cuttingoxygen will be supplied to the torches upon the `'next vclosure of. thegas -control vswitch LS2 in the ramp 53 vand on all subsequent indexingcycles as holes have now beendrilled in the liners and Heach `hole isnow indexed in alignment with each torch, and while the ports are beingname cut starting from these holes other holes are being drilled in theliners -for each successive indexing of the liners.

The momentary opening 'of the automatic stop switch LS8 by the tracerroller has no eiect at this time as the automatic stop switch LS|6 onthe counter mechanism is now open and will remain open until the linershave been indexed to the last position and 'the last ports flame cuttherein.

The tracer roller rolls around the template while the above indexingoperation occurred :and again closes the' index che'ck switch LSS andproceeds Von around the vtemplate if both detents 11 are in the notchesof the index plates 'Hand again rolls up the toe of the ramp 53 andcloses the time delay set switch LSH! to energize the windings and causeopening of the time delay relays TDR| and TDR2 to stop the tracer motorin a position to hold the switches LS||l, LSI, LS2 vand LS?. closed -aspreviously described... The resulting action caused by closure ofswitches LS'IB, LS|, LS2 and LSS in this case differs from thatpreviously described as the high pressure oxygen control switch LS|5 onthe' index. count*- ing mechanism is now closed. As explained closure ofLSH) again energize's the windings of the time delay relays TDRI andTDRZ for delayed closure of the contacts thereof. Delayed closure of therelay TD2 starts the second drilling operation. Closure of the gas turnon switch VLS2 causes reclosure of the contacts of the sequence relaySRS which energizes the low pressure oxygen and acetylene valves andthey open to preheat the edges of the drilled holes in the liners.Delayed closure of the time delay relay TDR3 then causes energi'zationof the high-pressure cutting oxygen valve SHPO through the now closedswitch LS| and the signal lamp and two more holes are drilled in theliners While cutting of the rst ports are being flame cut. It will benoted that when the tracer roller is in contact with the switches LSI,LS, LS3 between the toe in the ramp and the torches are accordinglydirected axially with respect to the previously drilled holes afterindexing thereof. This is the start of the second cycle of the tracerroller.

The roller again moves down the heel or the ramp and closes switchesLSl, L85 and LSi to again cause withdrawal of the ramp and repeat allthe circuit connection changes previously described. The rollercontinuing without hesitation past switches LS1, L58, LSS, missingswitches LSI, LS2 and LSS as the ramp is withdrawn from the template andcontinues on around the template opening during which time other holesare being drilled in the liners and rectangular ports are being burnedin the liners from the previously drilled holes.

Upon closure of the switches LSA, LSB and LSG the preheating and cuttinggases are turned off and the tracer motor is stopped until the seconddrilling operation is completed after which the second indexingoperation takes place. On the twenty-fifth cycle of the above describedthe drills enter the iirst flame cut ports and close the feed limitswitches LSI3 and LSH and return to the retracted position and there isno delay at the end of the last port burning operation to permit breakthrough of the drills.

When the tracer roller contacts the index trigger and automatic stopswitches LS1 and LS8 when the twenty-fourth and last port in the linersis being flame cut the liners are indexed to the last or startingposition. The ports of counter-mechanism CM at the end of the last ortwenty-fourth port burning operation are shown in Figure 13, and whenthe liners are indexed to the first or starting position the guide pin II9 falls in the connecting slot in the counter ratchet 99 as shown inFigure 13, and moves to the end of the arcuate slot |25 therein strikingthe abutment on the gas control'diskl 91 and turning off the high andlow oxygen, acetylene and hydrogen pilot valves 92, 9B, 9| and 89 beforethe automatic switch LSIE on the countermechanism is closed and the highpressure oxygen switch LSI5 is opened in the starting position.

Closure of the automatic stop switch LSIB on the counter-mechanism, inseries with the automatic stop switch LSB on the template, completes acircuit to the winding of the sequence switch SRI causing its contactsto open and cause the winding holding relay HRI to be deenergized andits contacts to open deenergizing the tracer motor and it stops in thestarting position between the stop switch LSB and the index check`switch LSS. Opening of the contacts of the relay SRI causesdeenergization of the winding of the holding relay HRZ and its contactsopen but this has no effect as the winding of the holding relay HRS isdeenergized and its contacts are in the position shown. Opening of thecontacts of the relay HRZ insures that the machine cannot be indexedaccidentally. Closure of the automatic switch LSIB on the countingmechanism and in series with the automatic stop switch LSB ontheternplate has no eiect as long as the tracer roller holds the switchLSB open, therefore the roller will coast oi the switch LSB causing itto close and energize the winding of the sequence relay SRI and itscontacts will close in the starting position as shown. The machineoperator then takes the liners having the ports cut therein oi thechucks and places other liners in the chucks for the automatic drillingand port cutting operations described above.

We claim:

1. In a name cutting machine, the combination of a machine frame, worksupporting mechanism rotatable in the frame, indexing mechanism on theframe operably connected to the work supporting mechanism, a template onthe frame having an opening therein, template tracer mechanism, acutting torch supported on the frame for movement in a plane adjacentthe supporting mechanism and connected to the tracer mechanism, saidtracer mechanism having a rotatable tracer roller retained in drivingengagement with the wall of the template opening for moving the torch,drilling mechanism on the frame in spaced relation to the cutting torchand a template ramp movable into the template opening and engageable bythe tracer roller for positioning the cutting torch in alignment withholes drilled by the work piece drilling mechanism upon operation of theindexing mechanism to start the cutting operation by the torch.

2. In a cylinder port flame cutting machine, the combination of amachine framehaving a coolant tank portion including an overow pipe tomaintain a constant level of the coolant therein, a cylinder supportingmechanism rotatable in the frame to retain the lower portion of thecylinder below the level of the coolant in the tank portion, work pieceindexing mechanism on the frame operably connected to the cylindersupporting mechanism, a template having an opening therein, templatetracer mechanism, a cutting torch connected to the tracer mechanism andmovable in a plane above the cylinder supporting means, said tracermechanism having a rotatable tracer roller retained in drivingengagement with the wall of the opening in the template for moving thetorch, drilling mechanism on the frame adjacent one side of the cylindersupporting means, and a template ramp movable into the template openingand engageable by the tracer roller for positioning the cutting torch inalignment with the drilled holes in the cylinder upon operation of theindexing mechanism.

3. In a flame cutting machine, the combination of a machine frame, workpiece supporting mechanisms rotatable in the frame, work piece indexingmechanism' on the frame operatively connected to the work piecesupporting mechanisms, a template on the frame having an openingtherein, template tracer mechanism having a tracer roller retained indriving engagement with the wall of said opening, a cutting torchmovably mounted on the frame adjacent each work piece, supportingmechanism means interconnecting the tracer'mechanism roller and torchesto cause the torches to follow the movement of the roller, work piecedrilling mechanisms, each mounted on the frame in angularly spacedrelation to each torch, and a template ramp movably mounted on the frameinto the opening in the template and engageable by the tracer roller forpositioning the cutting torches in alignment with the drilled holes inthe work pieces vupon operation of the indexing mechanism to start thecutting 'operations on the work pices by thev torches.. l Y 4 4, In anenginerc'ylinder port flame cutting machine, the combination ofa machineframe having a coolant tank provided with an overflow pipe to maintain aconstant `level of the coolant in the tank portion, cylinder supportingmechanisms rotatable rin the frame to rcetainl the Vlower portions ofthe cylinders Asubmerged in the coolant, work piece indexing means onthe frame operably connected to the cylinder supporting mechanisms, workpiece cutting torches, each movably mounted on the frame above cylindersupporting mechanisms, a, template mounted on the frame having anopening therein, template tracer mechanism connected to the torches andhaving a tracer roller urged into driving engagement with the wall ofthe template opening for moving the torches, drilling mechanisms,V eachlocated on the frame alongside of a cylinder supporting mechanism fordrilling a hole through a cylinder supported thereby and a template rampmovably mounted on the frame for entry into the opening in the templateand engageable by the tracer roller for initially positioning each ofthe cutting torches in alignment with a previously drilled hole in acylinder after indexing of the cylinder supporting mechanisms to startcutting operation by the torches. v

5. In a name cutting machine for cutting ports in engine cylinders, thecombination of a machine frame, cylinder supporting chucks rotatablysupported in the frame, power operated indexing mechanism on the frameoperably connected to the chucks, power operated drilling mechanism onthe frame adjacent eachchuck for drilling holes in the cylindersupported therein, a cutting torch mo-vably mounted on said frameadjacent each chuck and in spaced relation to each drilling mechanism, atemplate on the frame having an opening therein, power operated templatetracer mechanism connected to the torches and having a drivenmagnetizied roller in driving engagement with the wall of the templateopening to cause the torches to followV movement of the tracer roller, aramp movable on said frame, "power means operably connected to the rampfor moving the ramp into and out of the openingin the template andengageable by the tracer roller to cause the torches to be moved intoalignment with the drilled holes in the cylinders upon successiveoperation of the indexing means to start the cutting operations on thework pieces, a source of cutting gas for the torches, a cutting gasconduit including gas flow control means interconnecting the gas sourceand torches, power and gas now controlling means on said template andsaid ramp connected to the power operated and gas flowcontrol means andoperable by passage of the roller and other power and gas controllingmeans interconnected with the first mentioned power and gas controllingmeans and operable by said indexing means to perform drilling andindexing operations upon the nrst passage of the tracer roller .past thetemplate ramp and around the template opening and simultaneous drillingand cutting operations followed by indexing upon a preselected number ofpassages of the roller past the ramp and around the template opening toform circumferentially spaced ports in the cylinders.

6. In a llame cutting machine for cutting ports in engine cylinders, thecombination of a in a- Chi vlinder ,chucks rotatable therein,

power operated chuck lindexing mechanism, indexing counting mechanismoperably connected to the'index'ing mechanism and-movable each time thepower indexing mechanism* is operated, power operated drill feeding vandr'etracting mechanisms, each mounted on the frame alongside of acylinder liner-for drilling a hole therethrough, a cutting torchInovably mounted on the frame in spaced relation to each drillingmechanism for cutting a port each cylinder starting from a holepreviously drilled therein, after indexing of the cylinder, a templateon the frame having an opening therein to determine the shape of theport cut in the cylinders, a power operated magnetic roller magneticallyretained in driving engagement with the wall of the teinplate openingand operably connected to the torches to cause the torches t`o` vfollowmovement of the tracer mechanism, a ramp'movable on the frame into andout of the opening in the template for magnetic driving engagement ofthe tracer roller to position the 'torches over the drilled holes in thecylinders to start the cylinder port cutting operation, power operatedramp moving means on the frame, separate sources of pilot, preheatingand cutting gases for the torches, gas connections including gas supplyand cut on means between each gas source and the torches, controlconnections for the operated and gas supply and out oi means, saidcontrolconnections including power and gas supply controlling devices inspaced relation on the template and ramp operable upon contact by thetracer roller and other Ypower and gas controlling devices operablyconnected to the index counting mechanism to cut a preselected number ofcircumferentially spaced ports in the. cylinder liners and stopoperation of the machine.

7. In a port cutting machine for engine cylinder liners, angularlymovable lchucks for removably securing and centering 'engine cylinderliners therein, electropneumatic chuck indexing mechanism operableintermittently for indexing the chucks from a liner loading andunloading position to a preselected number of indexing positions andback to the loading and unloading position, an electropneumatic drillingmechanism and a movable. cutting torch adjacent each chuck to drill andflame cut Aa port. in e'ach liner at circumferentially spaced positions,a stationary template having an opening therein; an electricallyoperated template tracer mechanism having a rotatable tracer roller indriving engagement with the wall of the template opening to cause themechanism to move in a closed path, said tracer mechanism beingconnected tol the torches to cause the torchesto follow movementof thetracer mechanism, a movable template ramp, electropneumatic` ramp movingmeans for moving the ramp into andout of the template opening, saidrampV when in the template opening being engageable bythe tracer rollerto position Vthe torches inaxial alignment with previously drilled holesin the' liners after indexing thereof to start theporti cuttingoperation, a plurality koi? electrical control vvswitches disposed inspaced relation in said template and on said ramp operable separatelyand in 'combination by contact of'A the 'tracer roller when engaged withthe tem-plate and ramn: separate torch pilot, liner preheat-in'g,andliner cutting gas supply lines including meehanicalandelectromagnetic valves for the torches, said electrical controlswitchesand said mechanically operated valves operable by the indexingcountermechanism upon the start of indexing movement

